SDF
- Hierarchical Data Format
- Japan Self-Defense Forces
- Louisville Muhammad Ali International Airport
- Macross
- Robotech
- SDF Group
- SDF Public Access Unix System
- SQL Server Compact Edition Database File
- Scouts de France
- Search Dog Foundation
- Serb Democratic Forum
- Signed distance function
- Sikkim Democratic Front
- Silver diammine fluoride
- Simplified directional facility
- Social Democratic Federation
- Social Democratic Federation (United States)
- Social Democratic Forum
- Social Democratic Front (disambiguation)
- Socialist Democratic Federation (Japan)
- Soquel Demonstration State Forest
- Spatial Data File
- Standard Delay Format
- State defense force
- Stochastic discount factor
- Stromal cell-derived factor (disambiguation)
- Structure data file
- Subwavelength-diameter optical fibre
- Sudan Defence Force
- Synchronous Data Flow
- Synchronous diaphragmatic flutter
- Syntax Definition Formalism
- Syrian Democratic Forces
- Südtirol Digital Fernsehen